Andrdoid文件和SD文件

最新推荐文章于 2025-02-10 11:34:48 发布

原创最新推荐文章于 2025-02-10 11:34:48 发布 · 473 阅读

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本文将指导您如何在SD卡上进行文件读写操作，包括读取和写入文件的具体步骤和注意事项。

SD卡上文件写入

    	try{
    		if(Environment.getExternalStorageState()
    				.equals(Environment.MEDIA_MOUNTED))
    		{
    			File sdCardDir = Environment.getExternalStorageDirectory();
    			FileInputStream fis = new FileInputStream(sdCardDir.getCanonicalPath()+FILE_NAME);
    			BufferedReader br = new BufferedReader(new InputStreamReader(fis));
    			StringBuilder sb = new StringBuilder("");
    			String line = null;
    			while((line = br.readLine())!=null){
    				sb.append(line);
    			}
    			return sb.toString();
    		}
    	}catch(Exception e){
			e.printStackTrace();
		}

SD卡读取：

    	try{
    		if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
    			File sdCardDir = Environment.getExternalStorageDirectory();
    			File targetFile = new File(sdCardDir.getCanonicalPath()+FILE_NAME);
    			RandomAccessFile raf = new RandomAccessFile(targetFile, "rw");
    			raf.seek(targetFile.length());
    			raf.write(content.getBytes());
    			raf.close();
    		}
    	}catch(Exception e){
    		e.printStackTrace();
    	}